GridView控件在Asp.net中相当常用,以下是控件的解释,有些是常用的,有些是偶尔用到的,查找、使用、记录,仅此而已。(最后附带DropDownList控件)
ASP.NET中GridView常规用法
1、gridview前台界面代码
gridview创建列最主要的有两种方式:
1)数据绑定,表示数据绑定控件中作为文本显示的字段。DataField ="AnswerNum",AnswerNum是数据源中的一个字段。举例说明:
<asp:BoundField DataField ="AnswerNum" > <ItemStyle Width ="8%" HorizontalAlign ="Center" /> </asp:BoundField>
2)使用模板创建,举例说明:
<asp:TemplateField HeaderText ="查看"> <ItemTemplate > <asp:LinkButton ID ="LinkButtonViewSOption" runat ="server" CommandName ="ViewSOption" CommandArgument ='<%# Bind("QO_ID") %>'>描</asp:LinkButton> </ItemTemplate> <ItemStyle Width ="5%" HorizontalAlign ="Center" /> </asp:TemplateField>
ItemStyle是其模板样式,根据具体要求做出调整。
2、绑定数据源
this.gvQuestions.DataSource = ExamQuestionInfoList; this.gvQuestions.DataBind(); this.gvQuestions.PageIndex = 0;
gvQuestions为GridView控件,ExamQuestionInfoList为数据源,gridview的数据源可以是DataTable或者是数据集DataSet。
3、停留在某一行变色
private void ChangeColor(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor='#E6F5FA'"); e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c"); } }
protected void gvQuestions_RowDataBound(object sender, GridViewRowEventArgs e)
{
ChangeColor(sender, e);
}
4、操作某一行
直接举例说明
protected void gvSubjectiveOption_RowCommand(object sender, GridViewCommandEventArgs e) { int rowSelected = Convert.ToInt32(e.CommandArgument); questionOptionInfo = QuestionOptionBLL.GetModel(rowSelected); //查看 if (e.CommandName == "ViewSOption") { this.tbOptionStem.Text = questionOptionInfo.QO_Option; this.tbCorrectAnswer.Text = questionOptionInfo.QO_SubjectAnswer;//主观题答案 this.tbCorrectAnswerExplain.Text = questionOptionInfo.QO_Explain; //选项附件 string optionAccessoryStr = questionOptionInfo.QO_Accessory; string[] optionAccessoryArr = optionAccessoryStr.Split(','); for (int i = 0; i < optionAccessoryArr.Length; i++) { OptionAccessoryList.Add(optionAccessoryArr[i]); } BindOptionAccessoryList(); } if (e.CommandName == "DeleteOption") { QuestionOptionBLL.Delete(rowSelected); int EQ_ID = questionOptionInfo.EQ_ID; BindSubjectiveOption(EQ_ID);//重新绑定主观题问题信息 } }
e.CommandName对应前台界面的一些字段:
<asp:TemplateField HeaderText ="查看"> <ItemTemplate > <asp:LinkButton ID ="LinkButtonViewSOption" runat ="server" CommandName ="ViewSOption" CommandArgument ='<%# Bind("QO_ID") %>'>描</asp:LinkButton> </ItemTemplate> <ItemStyle Width ="5%" HorizontalAlign ="Center" /> </asp:TemplateField> <asp:TemplateField HeaderText ="删除" > <ItemTemplate > <asp:ImageButton ID ="ImageButtonDelete2" runat ="server" BorderStyle ="None" CommandName ="DeleteOption" CommandArgument ='<%# Bind("QO_ID") %>' ImageUrl ="~/images/delete.gif" /> </ItemTemplate> <ItemStyle Width ="5%" HorizontalAlign ="Center" />
</asp:TemplateField>
其中CommandName ="DeleteOption" CommandArgument ='<%# Bind("QO_ID") %>代表数据集中的某个字段。
5、添加Checkbox并且初始化台界面:
<asp:TemplateField > <ItemTemplate > <asp:LinkButton ID ="LinkButton1" runat ="server" CommandName ="selectCorrectAnswer" CommandArgument ='<%# Bind("QO_ID") %>'> <asp:CheckBox ID ="cbCorrectAnswer" runat ="server" /> </asp:LinkButton>
</ItemTemplate>
后台逻辑:
/// <summary> /// 初始化checkbox值 /// </summary> /// <param name="gv">gridview控件</param> /// <param name="dtSource">数据源</param> /// <param name="cbName">checkbox控件名称</param> /// <param name="cbValue">checkbox的值</param> private void InitializeCheckBox(GridView gv, DataTable dtSource, string cbName, string cbValue) { int count = dtSource.Rows.Count; if (count > 0) { for (int i = 0; i < count; i++) { CheckBox cb = gv.Rows[i].FindControl(cbName) as CheckBox; if (cb != null) { if (dtSource.Rows[i][cbValue].ToString() == "0") { cb.Checked = false; } else { cb.Checked = true; } } } } }
6、去掉gridview自带的分页数字
因为项目中在使用gridview时需要用到分页,而它本身的分页显得不足以表达项目所以表现的操作,所以需要添加新的分页,必然需要去到它原来的分页。
1)首先如果分页,必然要把属性AllowPaging设置为true。
2)PagerSettings-Visible属性设置为false,分页数字自此去掉。
3)手动添加分页,已经写出来了,但是项目还没有测试到,所以等此功能测试完毕后再添加此部分。
添加手动分页:
首先添加引用:<%@ Register Assembly ="AspNetPager" Namespace ="Wuqi.Webdiyer" TagPrefix ="webdiyer" %>
写前台界面:
<div id ="PagingDiv" style ="text-align:center ;vertical-align:middle;margin-top:4px" runat="server"> <webdiyer:AspNetPager ID ="AspNetPager1" runat ="server" AlwaysShowFirstLastPageNumber ="true" FirstPageText ="首页" LastPageText ="尾页" NextPageText ="下一页" PrevPageText ="上一页" ScrollBars ="Auto" ShowCustomInfoSection="Left" ShowPageIndexBox ="Always" AlwaysShow ="true" PageSize ="20" CustomInfoHTML="总记录数:<font color='#f30f30'>%RecordCount%</font>条 当前: 第<font color='blue'>%CurrentPageIndex%</font> 页,共 <font color='blue'>%PageCount%</font>页" CurrentPageButtonPosition ="Beginning" onpagechanged="AspNetPager1_PageChanged"></webdiyer:AspNetPager> </div>
后台添加逻辑:this.AspNetPager1.RecordCount = ExamQuestionInfoList.Count;
同时事件:
protected void AspNetPager1_PageChanged(object sender, EventArgs e) { this.gvQuestions.PageIndex = this.AspNetPager1.CurrentPageIndex - 1; this.gvQuestions.SelectedIndex = -1; //更新成功后更新界面 BindgvQuestions(); }
如果gridview中的记录很少,可能一两页就能解决问题,那自带分页完成能解决问题:
onpageindexchanging="gvObjectOption_PageIndexChanging"
protected void gvObjectOption_PageIndexChanging(object sender, GridViewPageEventArgs e) { this.gvObjectOption.PageIndex = e.NewPageIndex; this.gvObjectOption.DataBind(); }
分页到此完成。
2014年9月1日添加:
此处添加asp.net的gridview自带的编辑、更新、取消事件。比较简单,直接贴代码:
protected void gvExamQuestions_RowEditing(object sender, GridViewEditEventArgs e) { gvExamQuestions.EditIndex = e.NewEditIndex; BindgvExamQuestion(E_ID);//重新绑定 } /// <summary> /// 取消编辑事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void gvExamQuestions_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e) { gvExamQuestions.EditIndex = -1; BindgvExamQuestion(E_ID);//重新绑定 } /// <summary> /// 更新事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void gvExamQuestions_RowUpdating(object sender, GridViewUpdateEventArgs e) { //此处可以进行逻辑操作 gvExamQuestions.EditIndex = -1; BindgvExamQuestion(E_ID);//重新绑定 }
WPF中gridview使用
很久不做wpf项目了,今天做wpf时需要使用gridview控件,想到前段时间asp.net中总结过gridview控件,所以拿来使用,发现完全不同。没办法,忘记了,查找很久才找到以前代码,并记录,以便下次查找。
最主要的是xaml中gridview列表的排布以及样式的自定义。
<DataGrid AutoGenerateColumns="False" Grid.Column="1" Grid.Row="1" FontSize="18" VerticalContentAlignment="Center" HorizontalContentAlignment="Center" HorizontalGridLinesBrush="White" RowBackground="Black" Foreground="White" RowHeight="45" Background="Black" ColumnHeaderHeight="50" Height="528" HorizontalAlignment="Left" Margin="598,151,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="612" AllowDrop="False" FontStretch="Normal" FontStyle="Normal" FontWeight="Normal"> <DataGrid.ColumnHeaderStyle> <Style TargetType="DataGridColumnHeader"> <Setter Property="Background" Value="black"/> <Setter Property="Foreground" Value="white"/> <Setter Property="FontSize" Value="20" /> <Setter Property="HorizontalContentAlignment" Value="Center"/> <Setter Property="VerticalContentAlignment" Value="Center"/> </Style> </DataGrid.ColumnHeaderStyle> <DataGrid.Columns > <DataGridTextColumn Header="考号" Width="60" Binding="{Binding Path=user_ID}" IsReadOnly="True" ElementStyle="{StaticResource dgCell}"/> <DataGridTextColumn Header="成绩" Width="50" Binding="{Binding Path=Score}" IsReadOnly="True" ElementStyle="{StaticResource dgCell}"/> <DataGridTextColumn Header="项目" Width="50" Binding="{Binding Path=Curriculum}" IsReadOnly="True" ElementStyle="{StaticResource dgCell}"/> <DataGridTextColumn Header="考核时间" Width="145" Binding="{Binding Path=ExamTime}" IsReadOnly="True" ElementStyle="{StaticResource dgCell}"/> <DataGridTextColumn Header="耗时" Width="50" Binding="{Binding Path=TimeElapsed}" IsReadOnly="True" ElementStyle="{StaticResource dgCell}"/> <DataGridTextColumn Header="答题数" Width="65" Binding="{Binding Path=AllQuestionNUM}" IsReadOnly="True" ElementStyle="{StaticResource dgCell}"/> <DataGridTextColumn Header="答对数" Width="65" Binding="{Binding Path=correctQuestionNUM}" IsReadOnly="True" ElementStyle="{StaticResource dgCell}"/> <DataGridTextColumn Header="所有试题" Width="*" Binding="{Binding Path=AllQuestion}" IsReadOnly="True" ElementStyle="{StaticResource dgCell}"/> </DataGrid.Columns > </DataGrid >
上面是一次完整的gridview的使用,其中静态资源dgCell:
<Page.Resources > <ResourceDictionary > <Style x:Key="dgCell" TargetType="TextBlock"> <Setter Property="TextAlignment" Value="Center"/> </Style > </ResourceDictionary > </Page.Resources >
当然,最后的gridview数据源的绑定则是最简单的,一行代码:this.dataGrid1.ItemsSource = transcript.selectScore().Tables[0].DefaultView;
DropDownList常规用法:
1、DropDownList绑定简单数据源
此处暂且写一个简单的数据源,只是为了说明效果。
private void BindDropDownUp()
{
ArrayList al = new ArrayList();
al.Add("11");
al.Add("22");
al.Add("33");
this.DropDownList1.DataSource = al;
this.DropDownList1.DataBind();
}
获取DropDownList中选择的值:string text = this.DropDownList1.SelectedItem.Text;
2、DropDownList绑定较为复杂数据源
此处从数据库中提取一个数据集ds,DropDownList控件的text框中显示一个值,选中后在后台可以获取绑定的value。具体如下:
private void BindDropDownUp()
{
string strSql = "select * from [OSCE].[dbo].[QuestionType]";
DataSet ds = Query(strSql);
this.DropDownList1.DataSource = ds;
this.DropDownList1.DataTextField = "QT_Name";
this.DropDownList1.DataValueField = "QT_ID";
this.DropDownList1.DataBind();//将数据源绑定到类似( GridView) 控件
}
获取DropDownList控件text框的值:string text = this.DropDownList1.SelectedItem.Text;
获取DropDownList控件绑定的value值:string text2 = this.DropDownList1.SelectedValue;
3、在页面初始化时直接给DropDownList赋值
题外话:这个功能用的非常多,实现也很简单,但前提是你必须知道。找了好久才发现的。
ListItem li = DropDownList1.Items.FindByText("外科");//外科是想显现的值,前提是DataTextField中必须有
if (li != null)
{
int index = DropDownList1.Items.IndexOf(li);
DropDownList1.SelectedIndex = index;
}
总结到此,如果另有积累,再另行添加。